/*
 * Copyright 2002-2017 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.web.multipart.support;

import org.springframework.lang.Nullable;
import org.springframework.web.multipart.MultipartFile;

import java.beans.PropertyEditorSupport;
import java.io.IOException;

/**
 * Custom {@link java.beans.PropertyEditor} for converting
 * {@link MultipartFile MultipartFiles} to Strings.
 *
 * <p>Allows one to specify the charset to use.
 *
 * @author Juergen Hoeller
 * @since 13.10.2003
 */
public class StringMultipartFileEditor extends PropertyEditorSupport {

    @Nullable
    private final String charsetName;


    /**
     * Create a new {@link StringMultipartFileEditor}, using the default charset.
     */
    public StringMultipartFileEditor() {
        this.charsetName = null;
    }

    /**
     * Create a new {@link StringMultipartFileEditor}, using the given charset.
     *
     * @param charsetName valid charset name
     * @see java.lang.String#String(byte[], String)
     */
    public StringMultipartFileEditor(String charsetName) {
        this.charsetName = charsetName;
    }


    @Override
    public void setAsText(String text) {
        setValue(text);
    }

    @Override
    public void setValue(Object value) {
        if (value instanceof MultipartFile) {
            MultipartFile multipartFile = (MultipartFile) value;
            try {
                super.setValue(this.charsetName != null ?
                        new String(multipartFile.getBytes(), this.charsetName) :
                        new String(multipartFile.getBytes()));
            }
            catch (IOException ex) {
                throw new IllegalArgumentException("Cannot read contents of multipart file", ex);
            }
        }
        else {
            super.setValue(value);
        }
    }

}
